Expulsion fuse box



March 18, 1924. 1,486,960

L. C. HART EXPULSIQN FUSE BOX Filed Dec. 22 1921 2 Sheets-Sheet 1 thefuse tube and associated ,of' the box, 3

Patented Mar. 18, 1924.

f UNITED STATES 1,486,960 PATENT OFFICE.

LISTER C. KART, OF CLEVELAND, OHIO. ASSIGNOB TO EI-VOLTAGE EQUIPMENTOOM- rm, A CORPORATION OF PENNSYLVANIA.

EXPULSION FUSE BOX.

/ Application filed December 22, 1921. Serial No. 524,234.

To all whom it may concern:

Be it known that I, Lama citizen of the United States, and a resident ofCleveland, in the county of Cuyahoga and State of Ohio, have made anewand useful Invention in Expulsion Fuse Boxes, of which the following isa specification.

The invention relates to expulsion fuse boxes. It has for its mainobJect the provision of an improved form of fuse box construction inwhich provision is made to guard the box andfittings fromdestructionregardless of the excess of current causing the vaporization of theblow-out fuse. The

ordinary fusebox is relatively safe against,

injury from the usual excesses of current causin the fuse to blow, butwith excessively high currents the expansive force of the gasesgenerated in the box is suflicient to shatter it completely, and presentinvention is designed to safeguard the box under such unusualconditions. Certain embodiments of the invention are shown in theaccompap ying drawings wherein:

lgures 1 and 2 are vertical sections through the box taken at right anIce to each other. Fig. 8 is a detail section t rough:

a an Fig. 4 is a section through a mo difi construction.

Referring to the drawings, 1 is one side and 4 the top and bottom and 5the door, one of the hinges 6 of which is shown in Fig. 2. Insulatingmembers 7 and 8 extendin into the box the lead terminals 9 an 10 whichtermina s are con nected respectively at 11 and 12 to the switch members13 and 14. These members are preferably of the type shown in I;lig. 2and comprise the leafdmemberls1 and t e o posing 3 ring presse ar-s a dmemb r ada ted to receive be 'een tlihfm the leaf of t e other switchmembers. The other switch members 15 and 16 are integral with the metalcollars 17 and 18, carried by the fuse tube 19 which is composedofsuitable insulating composition.

The collar 17 carries the metal plu 20 provided with the binding screw21 fi ig. 3), while the collar 18 is provided at its lower end with theenlarged part 22 in the was side of which is threaded the binding screw23. The fuse wire 24' is clamped at its u per and lower endsrespectively. by the bidding screws 21 and 23. A rounded lug C. HART, a

25 is provided on the part 22 serving as an arcing tip to relieve thebinding screw from burning when the fuse blows. An insulating sleeve 26surrounds the collar 18 where it passes through the bottom of the box.

The collars 17 and 18 are provided with,

pairs of lugs 27'and 28 ada ted to be engaged by the brackets 29 an 30carried by the panel 31 of insulating materialcarried by the door orcover 5. v

The lower end of the fuse tube is preferably protected by the cap 32 offiber or cartridge paper which fits over the part 22 tightly enough tobe held by friction from accidental displacement... This cap not onlyacts: as a protection for the metal parts at the lower end of the fusethrough which current is passing, but also serves to indicate whet erthe fuse is still in service, since in case of a blow-out of the fuse,the cap is blown away. i a

n case excesive current is applied through the box, such as wouldordinarily destroy it because of the a plication of the explosive forceinside the ox, the force of the explosion will, in my construction, be'

vented to the outside of the box through the lower open end of the fusetube and the shattering of the box is avoided. At the same time the cap32 is blown ofi so that a casual inspectionwill indicate the conditionof the fuse. The mountin of the'fuse tube removably upon the ooks on thedoor and the use of the switch connections which are broken on openingthe door, make the parts convenient of access for replacement or repair.Fig. 4 illustrates a modified construction at the lower end of the fusetube 33 in which the fuse wire 34 instead of being secured to a bindingscrew carried by the lower end of the collar as in the otherconstruction, extends laterally beneath a binding nut 35 u nthe lowerend of the threaded rod 36.

'srod extends through the shelf 37 forming1 part of the door 38, and hasat its upper en a second binding nut 39. A connecting wire 41}. extendsfrom beneath this nut 39 up to the binding screw 42. Current istransmitted to thecollar 43, which carries a flange 45 which is made intwo pieces, one part being secured to the shelf 37 and the other to thebottom 4 of the box.

'What I claim is:

1. In combination, a fuse box, a fuse tube in the box with one end openand extending outside the box, a fuse wire in the tube extending throughthe open end of the tube to the outside of the box, and a closure capsurrounding the open end and adapted to be blown off when a blow-out ofthe fuse occurs.

2. combination, a fuse box, a fuse tube in the box with one end open andextending outside the box, a fuse wire in the tube extending through theopen end of the tube to the outside of the box, a pair of leadsextending into the box, connections therefrom to the ends of the fusewire, and a protecting esp held releasably in position around the lowerend of the tube and the fuse Wire leading from such end.

3. In combination, a fuse box, a fuse tube in the box with one end openand extending outside the box, a fuse wire in the tube extending throughthe 0 en end of the tube to the outside of the box, a pair of leadsextending into the box, switch members in the box to which the leads areconnected, other co-operating switch members carried by the fuse tube, adoor for the box on which the fuse tube is supported, and connectionsfrom the ends of the fuse wire to the switch members carried by the fusetube.

1*. In combination, a fuse box, a fuse tube in the box with one end openand extending outside the box, a, fuse wire in the tube extendingthrough the open end of the tube to the outside of the box, a pair ofleads extending into the box, switch members in the box to which theleads are connected, other co-operating switch members carried by thefuse tube, a door for the box on which the fuse tube is supportedremovubly and connections from the ends of the fuse wire to the switchmembers carried by the fuse tube.

In testimony whereof, I have hereunto subscribed my name this 19th dayof December, 1921.

M. EPsTnIN, EV. Simon.

